Means for preventing rebound of looms.



110.789.257. PATENTED MAY 9, 1905. J. H. COBB & J. M. MEHAFFEY. MEANS FOR PREVENTING REBOUND 0F LOOMS.

APPLICATION FILED NOV.14. 1904.

UNITED STATES Patented. May 9, 1905.

PATENT OF icE.

JAMES H. COBB AND JOHN M. MEHAFFEY, OF BELTON, SOUTH CAROLINA, ASSIGNORS TO DRAPER COMPANY, OF HOPEDALE, MASSACHUSETTS, A

CORPORATION OF MAINE.

MEANS FOR PREVENTING REBOUND OF LOOIVIS.

SPECIFICATION forming part Of Letters Patent No. 789,257, dated May 9, 1905.

Application filed November 14,1904- Serial No. 232,606.

To all whom it may concern.-

Be it known that we, JAMES H. COBB and JOHN M. MEHAFFEY, citizens of the United States, and residents of Belton, county of Anderson, State of South Carolina, have invented an Improvement in Means for Preventing Rebound of Loom-Lays, of which the following description, in connection with the accompanying drawings, is a specification, like numer IO als on the drawings representing like parts.

\Vhen a loom bangs 06, the reaction due to the sudden shock will often cause the lay to swing back or rebound, the crank-shaft making a reverse turn or partial turn. If it makes acomplete turn, as it frequently does, the lay will be moved forward to or toward front center and will thereby force the shuttle (then in the warp) into the cloth, making what is technically termed a smash. The dagger,

which should prevent such a smash, does not do so, because it is out of action, for as the lay swings forward on the reverse turn of the crank-shaft the momentum of the binders is sufficient to raise the dagger, and it has no time to drop and engage the frog that is to say, as the lay moves forward on the rebound the binders tend to swing rearward .just as if the shuttle were boxed, and of course the dagger is thereby rendered inoperative. Such 3o reverse rotation may also effect an additional movement of the take-up pawl tending to cause a thin place in the cloth being woven, and other parts of the loom tend to be thrown out of proper timing.

Our present invention has for its object the production of means to prevent rebound of the lay and reverse rotation of the crankshaft, whereby the objections before noted are obviated.

The novel features of our invention will be fully described in the subjoined specification and particularly pointed out in the following claims.

Figure 1 is a left-hand side elevation of a sufficient portion of a loom to be understood with one embodiment of our invention applied thereto, the mechanism being shown in normal position. Fig. 2 is a detail showing the rebound-preventing means in operation, and Fig. 3 is a detail in elevation and partial 5 section of a modified form of our invention.

Referring to Fig. 1 the shipper 1, annular brake member 2, secured to the crank-shaft 3, the belt shipper t (partly shown) and the usual connections between it and the shipper, the brakeshoe 5, pivotally mounted on the loom side and connected by a rod 6 with the frog 7, forming a part of the protector mechanism, the brake-actuator 8, fulcrumed at 9 and having an upturned toe 10 to cooperate 66 with the abutment 11 on the coni'iecting-rod, may be and are all substantially as in United States Patent No. 653,153. This actuator 8 is moved by the action of a weight 12 when released by the operation of .the stopping 5 means, as in said patent, the too 10 at such time acting upon the abutment 11 and moving the rod 6 to the right to apply the brake as the loom is stopped.

In one embodiment of our invention (see 7 Figs. 1 and 2) the member 2 is provided with a notch 13, adapted to be 'at times engaged by a pawl 14, fulcrumed on the arch 15 of the loom and acted upon by aspring 16, the pawl being so located that when it is in engagement with the notch the member 2, and consequently the crank-shaft 3, cannot rotate reversely to the arrow, Fig. 1. The notch is so disposed on said member 2 that it will be adjacent the pawl when the brake is applied or when the lay is very near front center, so

that when the loom bangs off the immediate engagement of the pawl and notch will prevent rebound and reverse rotation of the crankshaft. 5

To normally retain the pawl inoperative, we have secured to the toe 1O an upturned and rearwardly-bent arm 17, having at its free end a lateral lug 18, which projects under and holds the pawl lifted, as in Fig. 1.'

When the brake mechanism operates, as the loom stops the toe 1O rocks, and thereby withdraws the lug 18 from beneath the pawl, and the latter thereupon engages the notch 13 (see Fig. 2) and prevents retrograde rotation of the crank-shaft.

When the actuator 8 is restored to normal position, the toe swings the arm 17 backward and the lug 18 disengages the pawl from the notch and maintains it inoperative until again required to act.

In Fig. 3 we have shown a modification of our invention, the annular rotatable member 2 being arranged to cooperate with a frictionlock when any tendency to reverse its rotation occurs.

A housing 19 is secured to any suitable part of the loom-frame containing a pocket 20, which loosely receives a ball 21, the latter being held between the periphery of the member 2 and the wall 22 of the pocket, said wall converging toward the periphery.

So long as the crank-shaft rotates in the proper direction (indicated by the arrow) the ball is moved constantly toward the larger upper end of the pocket; but any reversal of rotation causes the ball to become locked between the periphery of the member 2 and the wall 22 of the pocket at its lower end, and rotation of the shaft 3 is instantly stopped.

The brake member 2 is a convenient part of the loom to cooperate with the device for preventing reverse rotation of the crank shaft;

but our invention is not restricted to such arrangement, nor to the particular construction herein shown and described.

Having fully described our invention, what we claim as new, and desire to secure by Letters Patent, is

1. In a loom, an annular member fast on a rotating part of the loom, and means cooperating directly and positively with said member to stop reverse rotation thereof at a definite point when the loom is stopped.

2. In a loom, a lay-actuating shaft having an attached annular member, a shipper, and means to cooperate directly and positively with said member and stop reverse rotation of said shaft at a definite point when the shipper is released.

3. In a loom, a crank-shaft having an attached annular brake member, and means cooperating directly and positively with said member to stop reverse rotation of the crankshaft at a definite point when the loom is stopped.

4:. In a loom, a crank-shaft having an attached annular brake member provided with a notch, a cooperating brake-shoe and means to operateit, a pawl adapted to engage the notch and stop reverse rotation of the crank-shaft ata definite point, a fixed support on which the pawl is mounted, and acontrolling device for the pawl, actuated by the means for operating the brake-shoe, whereby when the brake is set the pawl is released to cooperate with the notch.

5. In a loom, a shipper, a crank-shaft having an attached annular member having a notch in its periphery, brake mechanism adapted to operate automatically when the shipper is released, a pawl to cooperate with said notched member and stop reverse rotation of the crank-shaft at a definite point, a fixed support for the pawl, and a releasing device for the pawl, governed by the brake mechanism.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

JAMES H. COBB. JOHN M. MEHAFFEY. Witnesses:

L. F. CURRY, WALTER E. GREEK. 

